syzbot


KASAN: out-of-bounds Write in end_buffer_read_sync

Status: upstream: reported C repro on 2023/05/29 19:57
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+a4e609731ea45e9086d3@syzkaller.appspotmail.com
First crash: 388d, last: 4h46m
Bug presence (1)
Date Name Commit Repro Result
2024/05/07 upstream (ToT) dccb07f2914c C [report] KASAN: out-of-bounds Write in end_buffer_read_sync
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: out-of-bounds Write in end_buffer_read_sync ntfs3 C done 3482 52m 787d 0/27 upstream: reported C repro on 2022/04/25 03:07
linux-5.15 KASAN: out-of-bounds Write in end_buffer_read_sync origin:lts-only C error 42 1d17h 443d 0/3 upstream: reported C repro on 2023/04/04 06:42
Fix bisection attempts (3)
Created Duration User Patch Repo Result
2024/03/20 02:16 3h00m bisect fix linux-6.1.y job log (0) log
2024/01/04 10:55 1h56m bisect fix linux-6.1.y job log (0) log
2023/12/04 05:39 1h49m bisect fix linux-6.1.y job log (0) log

Sample crash report:
==================================================================
BUG: KASAN: out-of-bounds in instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
BUG: KASAN: out-of-bounds in atomic_dec include/linux/atomic/atomic-instrumented.h:257 [inline]
BUG: KASAN: out-of-bounds in put_bh include/linux/buffer_head.h:320 [inline]
BUG: KASAN: out-of-bounds in end_buffer_read_sync+0xbd/0xd0 fs/buffer.c:160
Write of size 4 at addr ffffc900030cf820 by task ksoftirqd/0/15

CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.1.90-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15f/0x4f0 mm/kasan/report.c:395
 kasan_report+0x136/0x160 mm/kasan/report.c:495
 kasan_check_range+0x27f/0x290 mm/kasan/generic.c:189
 instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
 atomic_dec include/linux/atomic/atomic-instrumented.h:257 [inline]
 put_bh include/linux/buffer_head.h:320 [inline]
 end_buffer_read_sync+0xbd/0xd0 fs/buffer.c:160
 end_bio_bh_io_sync+0xb3/0x110 fs/buffer.c:2655
 req_bio_endio block/blk-mq.c:777 [inline]
 blk_update_request+0x53b/0x1010 block/blk-mq.c:922
 blk_mq_end_request+0x3a/0x70 block/blk-mq.c:1051
 blk_complete_reqs block/blk-mq.c:1131 [inline]
 blk_done_softirq+0xf8/0x140 block/blk-mq.c:1136
 __do_softirq+0x2e9/0xa4c kernel/softirq.c:571
 run_ksoftirqd+0xc1/0x120 kernel/softirq.c:934
 smpboot_thread_fn+0x52c/0xa30 kernel/smpboot.c:164
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>

The buggy address belongs to the virtual mapping at
 [ffffc900030c8000, ffffc900030d1000) created by:
 copy_process+0x637/0x4060 kernel/fork.c:2098

The buggy address belongs to the physical page:
page:ffffea00019b5c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x66d70
memcg:ffff888018779602
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff888018779602
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 9488, tgid 9488 (syz-executor952), ts 1363633389546, free_ts 1363628782632
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513
 prep_new_page mm/page_alloc.c:2520 [inline]
 get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279
 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5547
 vm_area_alloc_pages mm/vmalloc.c:2983 [inline]
 __vmalloc_area_node mm/vmalloc.c:3051 [inline]
 __vmalloc_node_range+0x96c/0x1460 mm/vmalloc.c:3223
 alloc_thread_stack_node kernel/fork.c:311 [inline]
 dup_task_struct+0x3e5/0x6d0 kernel/fork.c:988
 copy_process+0x637/0x4060 kernel/fork.c:2098
 kernel_clone+0x222/0x920 kernel/fork.c:2682
 __do_sys_clone3 kernel/fork.c:2981 [inline]
 __se_sys_clone3+0x373/0x410 kernel/fork.c:2965
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1440 [inline]
 free_pcp_prepare mm/page_alloc.c:1490 [inline]
 free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358
 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3453
 kasan_depopulate_vmalloc_pte+0x66/0x80 mm/kasan/shadow.c:375
 apply_to_pte_range mm/memory.c:2645 [inline]
 apply_to_pmd_range mm/memory.c:2689 [inline]
 apply_to_pud_range mm/memory.c:2725 [inline]
 apply_to_p4d_range mm/memory.c:2761 [inline]
 __apply_to_page_range+0x9c5/0xcc0 mm/memory.c:2795
 kasan_release_vmalloc+0x96/0xb0 mm/kasan/shadow.c:492
 __purge_vmap_area_lazy+0x157c/0x1720 mm/vmalloc.c:1774
 drain_vmap_area_work+0x3c/0xd0 mm/vmalloc.c:1803
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Memory state around the buggy address:
 ffffc900030cf700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900030cf780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc900030cf800: f1 f1 f1 f1 00 00 00 00 00 00 00 f2 f2 f2 f2 f2
                                  ^
 ffffc900030cf880: 00 f2 f2 f2 01 f3 f3 f3 00 00 00 00 00 00 00 00
 ffffc900030cf900: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
==================================================================

Crashes (21):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/06 21:44 linux-6.1.y 909ba1f1b414 d884b519 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2023/05/29 19:57 linux-6.1.y a343b0dd87b4 cf184559 .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2023/08/12 06:29 linux-6.1.y 1321ab403b38 39990d51 .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2024/06/20 20:27 linux-6.1.y eb44d83053d6 dac2aa43 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2024/06/09 12:32 linux-6.1.y 88690811da69 82c05ab8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2024/06/06 13:48 linux-6.1.y 88690811da69 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2024/06/06 13:40 linux-6.1.y 88690811da69 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2024/06/06 09:18 linux-6.1.y 88690811da69 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2024/06/06 09:10 linux-6.1.y 88690811da69 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2024/06/06 09:06 linux-6.1.y 88690811da69 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2024/06/04 18:51 linux-6.1.y 88690811da69 11f2afa5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2024/06/01 06:18 linux-6.1.y 88690811da69 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2024/06/01 05:07 linux-6.1.y 88690811da69 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2024/05/10 22:38 linux-6.1.y 909ba1f1b414 f7c35481 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2024/05/09 00:49 linux-6.1.y 909ba1f1b414 20bf80e1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2024/05/08 00:45 linux-6.1.y 909ba1f1b414 4cf3f9b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2024/04/03 11:38 linux-6.1.y e5cd595e23c1 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2024/03/29 13:03 linux-6.1.y e5cd595e23c1 c52bcb23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2023/11/02 12:28 linux-6.1.y 4a61839152cc 69904c9f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: out-of-bounds Write in end_buffer_read_sync
2024/06/01 21:12 linux-6.1.y 88690811da69 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: out-of-bounds Write in end_buffer_read_sync
2024/01/07 23:56 linux-6.1.y 38fb82ecd144 d0304e9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: out-of-bounds Write in end_buffer_read_sync
* Struck through repros no longer work on HEAD.